Power-operated safety razor



April 22 1924.

F. A. CHAMBERLAND POWER OPERATED SAFETY RAZOR Filed June 25 1923 wax OR %4&

Patented Apr. :22, 1924.,

POWER-OPERATED SAFETY RAZOR.

' Application filed June 25, 1923. Serial No. 647,467.

To all whom it may concern Be it known that I, FRANK A. CHAMBER- LAND, a citizen of the United States, residing at Boston, in the county of Suffolk and 5 State of Massachusetts, have inventedvcertain new and useful Improvements in Power-Operated Safety Razors, of which the following is a specification.

This invention relates to safety razors, more particularly to that type of safety razor in which the blade is movably related to the guard.

The object of my invention is to provide a safety razor in which the blade is moved by power to produce a shearing cut as it is drawn over the face.

To accomplish this object I provide means for imparting a 'gyratory motion to the blade in a plane perpendicular to and parallel with the cutting edge.

ll am aware that devices have been employed for reciprocating a blade, but the action which I impart to the blade is not equivalent, as the gyratory movement produces a combined cutting and scraping action, which is not present when the blade is reciprocated.- This invention consists in the novelty of action and construction illustrated in the accompanying specifications and claims and drawings forming a part thereof.

In the drawings a preferred form is shown and details of construction may be varied without departing from the spirit and scope of the invention.

35 Fig. 1 is sectional front elevation. Fig. 2 is a section on 2-2 Fig. 1.

Fig. 3 is a plan showing the roll guard and blade.

Fig. 4 is a section on 4-4 Fig. 1.

m Fig. 5 is a" perspective view of a blade and holder. I 1

Fig. 6 is an enlarged portion of the holder su port extension. 7

ig. 7 is a diagram illustrating the move- {5 ment of the blade and holder when in 'operation.

Fig. 8 illustrates the razor as connected to a source of power.

In the drawings 10 is a chambered base within which are contained the operative parts to be presently described. 11 is a cover adapted to engage the base and in connection therewith, to enclose the parts and serve as a handle when in operation.

Projecting inwardly from and secured to the main wall of the chamber 10 is a stud 12 on which is journaled a worm gear 13, the ball 14 serving as an antifriction thrust bearing against the end of the stud 12.

Meshing with the worm gear 13 is the worm 15, rigid with the shaft 16 which is journaled at 17 and 18, in bearing secured to one side wall of the chamber 10. In the upper bearing 17 1 use a ball 19 to serve as a thrust bearing for the shaft 16. 'The shaft 16 is extended downwardly at 20 to permit the attachment of a flexible shaft 21 Which may be rotated by means of a prime mover, here shown as a motor 22. Projecting from one face of the gear 13 is a wrist pin 23 adapted to rotatably engage the older support 24 on which is mounted the blade holder 25.

This holder slidingly engages the top wall of the chamber 10 at 26, and as the gear 13 is rotated the wrist pin 23 serves as an'eccentric to move the holder support 24.

This motion inconnection with the limiting action at 26 converts the rotary motion of the holder support at 23 into a gyratory movement of the blade. This is shown more plainly in the diagram Fig. 7. d When the wrist pin is in the position 27 the blade in its holder is at 28 the edge being parallel to a line passing through the axis of the stud 12 and bisecting the contacting face of the worm. As the gear is rotated the blade is rated the paths of the ends of the blade eing shown respectively at 29 and 30, the positions of the blade corresponding to the position of wrist pin at 27 and 27 being indicated respectively at 28 and 28". The result-in action of the blade thus becomes a combined cutting and' scraping action which obviates the danger of gashing the face which is present in a reciprocatory action; it also assures the cutting action which is not present when the blade is drawn over the face with a scraping movement, which is the way in which a safety razor is commonly used. With this invention, however, this is the logical way to operate therazor the gyratory action producing the combined shearin and scraping action.

The holder support 24 is provided with an extension 31 which is adapted to engage and loosely hold a ball 32.

This ball projects beyond the surfaces of the extension and bears against the walls 33 and 34 rigid with the bottom wall of the chamber. This construction provides an antifriction guide for the holder support as it is operated by means of the gear 13.

The blade holder 25 is rigidly secured to the holder support 24 in any suitable manner and is formed from sheet metal into an approximately elliptic, shape, open on one side, the blade a being inserted within the ellipse until it engages the abutment 41 which may be formed integral with the holder. The upper wall 42 of the holder 25, is adapted to engage the top of the razor blade, which is held firmly in place by means of the set screw 43.

The lower wall of the holder is provided with serrations 44 one near each end being extended and formed with a hook 46 which limits the movement of the blade outwardly when the set screw 47 is tightened to secure the blade firmly in "place in connection with the set screw 43. Other extensions from the lower wall of the holder, are formed at 48 to serve as bearings for the trunnions 49 of a roll 50 which bears on the under side of the blade and serves to roll the beard cuttings and lather between the serrations of the 'holder and the roll, thus facilitating the cleaning of the apparatus after use.

. secured to the cover. below the bottom of the cover and thumb I have provided a guard to protect the face against excessive exposure to the blade which I prefer to construct and mount in the following manner :A length of music wire 51 of suitable diameter and length is threaded on both ends and passed through a roll 52 which is rotatable thereon. The wire is then bent to a predetermined form and the ends inserted through the lugs 53 secured to the cover 11 and adapted to serve as a bearing in which the formed wire is slidable: The threaded ends of this guide are adapted to engage the sleeve nuts 54 which have a rotative bearing in lugs 55 These nuts .project pieces 56 are secured to these projections. By turning the thumb pieces the spring action of the wire 51 serves to adjust the guard roll 52 relative to the blade edge.

Having described my invention I claim I -1.- In a power operated safety razor, the combination of a base, and a blade holder, and means for impartin to a blade held in the holder, a combine gyratory and reciprocatory movement relative to the base.

2. In a power operated razor, the combination of a base; a blade holder; a yieldingly supported blade guard; and means for imparting to a blade held in the holder,

a gyratory movement relative to the blade guard. i" 3. In a power operated razor, the combination of a base, a blade holder; a yieldingly supported guard; means for adjusting the ard relative to the holder; and means for imparting to a blade held in the holder, a gyratory movement relative to the blade guard.

4. A ower driven safety razor comprising a c mbered base; a blade holder; a holder support adapted to slidabl engage the chambered base; means for sliding the holder support 'for the purpose of imparting to a blade held in the holder, 9. combined gyratory and reciprocatory movement relative to the chambered base.

5. A power driven safety razor comprising a chambered base; a blade holder; a.

holder support adapted to slidably engage the chambered base; a wrist pin, the axis of which is eccentric to a fixed axis and which is adapted to engage the holder support: means for rotating the wrist pin about the fixed axis for thepurpose of imparting parallel to the edge of the blade; a yield ingly supported blade guard; and means for imparting to a blade held in the holder a gyratory movement relative to the blade guard.

7. In a power operated razor, the combination of a base, a blade holder; a roll rotatable on trunnions journaled in the blade holder and ada ted to engage the under side of a razor bla e secured thereto, on a line parallel to the edge of the blade; a roll journaled in yielding supports, and adapted to enga ethe upper side of a razor blade secure to the holder, for'thdpurpose of serving as a blade guard; means for impartin a gyratory movement to the blade; an means for adjusting the roll guard relative to the holder.

8. A ower driven safety razor comprismg a c ambered base; a blade holder; a holder support adapted to slidably enga e the chambered base; a worm gear rotatab e.

III

ratory and reciprocatory movement to a 'blade secured to the blade holder.

FRANK A. CHAMBERLAND. 

